Morten wrote:

"John" wrote in message
news:Efm6c.852673$X%5.396735@pd7tw2no...

Check out this link, it is ingenious...and cheap !
http://www.mnwgs.org/articles/diyuwlts.htm


And when the lamp blows you have a nice dead (and unrepairable) underwater
light :-)

Make another. It's just a bulb embedded in a loose chunk of concrete.